81352287 has 6 divisors (see below), whose sum is σ = 117508872. Its totient is φ = 54234852.

The previous prime is 81352261. The next prime is 81352289. The reversal of 81352287 is 78225318.

It is not a de Polignac number, because 81352287 - 2⁸ = 81352031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81352289) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4519563 + ... + 4519580.

It is an arithmetic number, because the mean of its divisors is an integer number (19584812).

Almost surely, 2^81352287 is an apocalyptic number.

81352287 is a deficient number, since it is larger than the sum of its proper divisors (36156585).

81352287 is a wasteful number, since it uses less digits than its factorization.

81352287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9039149 (or 9039146 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 81352287 is about 9019.5502659501. The cubic root of 81352287 is about 433.3012302976.

The spelling of 81352287 in words is "eighty-one million, three hundred fifty-two thousand, two hundred eighty-seven".